I definitely agree about diving into development as the best source of mastering programming, and it's obviously my main method of learning; my question was not intended to come off as an avoidance of hands-on learning, but rather a way to find additional means to accelerate my learning. I have found extensive tutorials online, but they are both redundant and typically aimed at the fundamentals of rails. I constantly run into the advice of "read through code/documentation" but rarely am pointed in the direction of useful repositories to do this. After sifting through github for a bit, I found no easy way to figure out good codebases to read through.
I think reading through code is a really valuable supplement to the learning process, especially when dealing with a framework like rails which is so heavily convention based. I find reading through code to be the quickest way of exposing myself to the standard idioms of rails based development.